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Texas Instruments INA105KUG4
- Part No.:
- INA105KUG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA105KUG4.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,058
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Product details
Overview
INA105KUG4 from Texas Instruments is a precision unity-gain differential amplifier IC designed for high-accuracy signal conditioning in industrial measurement systems. It delivers 72dB minimum CMRR, ±0.025% maximum gain error, and 1MHz bandwidth with ±20μV/°C offset drift - enabling accurate differential voltage sensing in battery test equipment and servo feedback loops.
For engineers reviewing the INA105KUG4 datasheet, INA105KUG4 pinout, INA105KUG4 application, or INA105KUG4 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The INA105KUG4 integrates a precision bipolar op amp with four laser-trimmed 25kΩ metal-film resistors on a single die to form a fixed G = 1 difference amplifier. Its resistor network achieves precise ratio matching (not absolute value), ensuring stable gain accuracy and CMRR over temperature via matched TCR.
It operates from ±5V to ±18V supplies, supports input common-mode voltages up to ±20V (beyond rails), and uses internal clamping to protect inputs. The device has no programmable modes - it functions exclusively as a precision differential amplifier with reference-summing capability at Pin 1 (Ref).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Accuracy | ±0.025% max error ensures ≤250μV output error for 1V differential input - critical for sub-mV-level sensor signal fidelity. |
| CMRR | 72dB min (at DC) rejects >99.9% of common-mode interference - essential when measuring mV signals atop multi-volt noise floors. |
| Offset Voltage | 500μV max enables direct measurement of low-level differential signals without manual nulling in many applications. |
| Bandwidth | 1MHz typical allows accurate amplification of fast transients in motor control feedback or battery formation pulses. |
| Input Impedance | 50kΩ differential and common-mode impedance simplifies source matching and minimizes loading on high-Z sensors. |
| Slew Rate | 2–3V/μs (CSO:SHE) supports clean step response for 10V transitions in <5μs - verified for 0.01% settling in position feedback. |
| Supply Range | ±5V to ±18V dual supply enables operation in legacy industrial rails and compatibility with ±12V/±15V systems. |
Pinout & Package
INA105KUG4 is supplied in an 8-pin SOIC (Small Outline Integrated Circuit) package, 4.90mm × 6.00mm footprint, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +In (Pin 3) | Noninverting input | 25kΩ resistor connects to op amp noninverting terminal; must match source impedance at –In for optimal CMRR. |
| –In (Pin 2) | Inverting input | 25kΩ resistor connects to op amp inverting terminal; mismatch >5Ω vs +In degrades CMRR by ~10dB. |
| Output (Pin 6) | Differential output | Low-impedance (0.01Ω) buffered output capable of sourcing 40–70mA; swing limited by supply and load. |
| Ref (Pin 1) | Reference input | Summing node: applied voltage adds directly to output; keep source impedance <10Ω to preserve CMRR. |
| V+ (Pin 7) | Positive supply | Highest potential rail; requires local 0.1μF ceramic bypass capacitor placed adjacent to pin. |
| V– (Pin 4) | Negative supply | Lowest potential rail; same bypass requirement as V+; forms bipolar supply pair with V+. |
| Sense (Pin 5) | Sense input | 25kΩ resistor tied to op amp inverting terminal; used in alternate configurations like instrumentation amp front-end. |
| NC (Pin 8) | No connection | Internally unconnected; may be left floating or tied to ground for mechanical stability - no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | Enables 72dB CMRR and ±0.025% gain error without external precision resistors - eliminates board-level trimming and layout sensitivity. |
| Rail-to-rail input common-mode range | Supports ±20V input with ±15V supplies - allows direct interfacing to industrial sensors and battery strings without level-shifting circuitry. |
| Matched resistor TCR | Maintains gain accuracy and CMRR across –40°C to +85°C - avoids recalibration in temperature-varying environments like factory automation. |
| Integrated op amp + resistors | Reduces component count and PCB area vs discrete solutions - improves reliability and repeatability in high-volume production. |
| Reference-summing capability | Enables offset nulling (via Ref pin) and bipolar output shifting - simplifies calibration in data loggers and transmitter designs. |
Applications
| Battery Cell Formation & Test | Servo Drive Position Feedback |
|---|---|
|
Use Scenario: High-precision voltage monitoring during charge/discharge cycling of Li-ion cells under dynamic load. IC Role / Device Role / Timing Role: Differential amplifier measuring cell voltage while rejecting pack-level common-mode noise from switching converters. Use Value: 72dB CMRR and ±0.025% gain error ensure <1mV measurement uncertainty across 0–4.2V range - meeting JEDEC JESD22-A114 qualification thresholds. |
Use Scenario: Analog feedback path in closed-loop servo controllers using resolvers or analog encoders. IC Role / Device Role / Timing Role: Signal conditioner extracting clean differential position error signal from noisy motor drive environment. Use Value: 1MHz bandwidth and 5μs 0.01% settling support real-time correction at >10kHz loop rates - maintaining positional accuracy within ±0.05°. |
| Level Transmitter | String Inverter Monitoring |
|
Use Scenario: 4–20mA current loop transmitter converting tank level sensor output to standardized industrial signal. IC Role / Device Role / Timing Role: Precision difference amplifier isolating bridge sensor output from ground-referenced supply and load variations. Use Value: ±20V input common-mode range accommodates wide ground potential differences in field installations - eliminating need for isolated power supplies. |
Use Scenario: DC string voltage monitoring in photovoltaic inverters where multiple series-connected panels generate high common-mode voltages. IC Role / Device Role / Timing Role: Differential front-end amplifier rejecting inverter switching noise while resolving small voltage imbalances across panels. Use Value: Laser-trimmed resistors maintain 72dB CMRR even at 10kHz switching frequencies - preventing false imbalance alarms during MPPT operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA106KP | Higher CMRR (80dB min), lower offset (250μV max), but only available in PDIP/TO-99 - no SOIC option. | Better suited for lab-grade instrumentation where ultimate DC accuracy outweighs SMT assembly needs. | Select INA106KP only if CMRR >80dB is mandatory and SOIC packaging is not required. |
| AD629ARZ | Higher supply range (±18V), integrated laser-trimmed thin-film resistors, but lower bandwidth (500kHz typ) and no Ref pin. | Preferred for high-voltage industrial monitoring where rail extension matters more than reference summation. | Choose AD629ARZ when operating near ±18V rails and reference-summing functionality is unnecessary. |
Compared with INA105KUG4, INA106KP offers superior DC precision but lacks surface-mount availability, while AD629ARZ extends voltage range and simplifies layout but sacrifices bandwidth and removes offset-nulling flexibility - making INA105KUG4 the balanced choice for SMT-based industrial signal chains requiring both accuracy and design adaptability.
Availability
INA105KUG4 is available at Aetrix Electronics and suitable for battery formation systems, servo drive feedback circuits, and industrial level transmitters requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for INA105KUG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and industrial interface solutions.
The INA105 belongs to TI's precision differential amplifier product line, engineered specifically for high-accuracy measurement applications where laser-trimmed monolithic resistor networks eliminate external component variability and improve system-level repeatability.
FAQ
What is the maximum input common-mode voltage for INA105KUG4?
The INA105KUG4 supports an input common-mode voltage range of ±20V when operated with ±15V supplies. This extended range allows direct interfacing with high-voltage industrial sensors and battery strings without external level-shifting circuitry. Operation beyond ±20V requires limiting input current to 1mA per pin to avoid damage.
Can INA105KUG4 be used with single-supply operation?
Yes, INA105KUG4 supports single-supply operation from 10V to 36V total supply range. However, its input common-mode and output swing capabilities are optimized for dual-supply use. When using single supply, ensure the Ref pin is biased appropriately and verify that input signals remain within the specified common-mode range relative to the chosen reference point.
Does INA105KUG4 require external precision resistors?
No, INA105KUG4 does not require external precision resistors. It integrates four laser-trimmed 25kΩ metal-film resistors on-die to achieve ±0.025% gain error and 72dB CMRR. This monolithic architecture eliminates the need for external matching components, reducing board space, cost, and sensitivity to layout-induced mismatches.
What is the purpose of the Sense pin (Pin 5) on INA105KUG4?
The Sense pin (Pin 5) on INA105KUG4 connects to an internal 25kΩ resistor tied to the op amp's inverting terminal. It enables advanced configurations such as instrumentation amplifier front-ends, precision summing, or gain-adjustment topologies - extending functionality beyond basic differential amplification while retaining resistor matching benefits.
How does the Ref pin (Pin 1) affect INA105KUG4 output?
The Ref pin (Pin 1) on INA105KUG4 serves as a summing node: any voltage applied to it adds directly to the differential output. This allows precise offset nulling (e.g., applying –Vos to cancel inherent offset) or bipolar output shifting. To preserve CMRR, the source impedance driving Ref must be kept below 10Ω - typically achieved with a low-impedance buffer or DAC output.
INA105KUG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 1.5mA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA105KUG4 FAQ
1.How can I place an order for INA105KUG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA105KUG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for INA105KUG4 reliable?
The price and inventory of INA105KUG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA105KUG4 is usually 5 days.
3.What payment methods are accepted for INA105KUG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA105KUG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA105KUG4?
INA105KUG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA105KUG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for INA105KUG4?
For technical support, including INA105KUG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA105KUG4 requirements.
6.How does Aetrix verify that INA105KUG4 is sourced from the original manufacturer or authorized distributors?
All INA105KUG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that INA105KUG4 meets industry standards.
7.What is the process for return or replacement of INA105KUG4?
All INA105KUG4 units undergo pre-shipment inspection (PSI). If there is an issue with INA105KUG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The INA105KUG4 part is unused and in its original packaging.
Return procedure for INA105KUG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA105KUG4 Tags
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